drivers/input/keyboard/omap4-keypad.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * OMAP4 Keypad Driver
  *
  * Copyright (C) 2010 Texas Instruments
  *
  * Author: Abraham Arce <x0066660@ti.com>
  * Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
  */

 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/errno.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/input.h>
 #include <linux/input/matrix_keypad.h>
 #include <linux/slab.h>
 #include <linux/pm_runtime.h>
 #include <linux/pm_wakeirq.h>

 /* OMAP4 registers */
 #define OMAP4_KBD_REVISION		0x00
 #define OMAP4_KBD_SYSCONFIG		0x10
 #define OMAP4_KBD_SYSSTATUS		0x14
 #define OMAP4_KBD_IRQSTATUS		0x18
 #define OMAP4_KBD_IRQENABLE		0x1C
 #define OMAP4_KBD_WAKEUPENABLE		0x20
 #define OMAP4_KBD_PENDING		0x24
 #define OMAP4_KBD_CTRL			0x28
 #define OMAP4_KBD_DEBOUNCINGTIME	0x2C
 #define OMAP4_KBD_LONGKEYTIME		0x30
 #define OMAP4_KBD_TIMEOUT		0x34
 #define OMAP4_KBD_STATEMACHINE		0x38
 #define OMAP4_KBD_ROWINPUTS		0x3C
 #define OMAP4_KBD_COLUMNOUTPUTS		0x40
 #define OMAP4_KBD_FULLCODE31_0		0x44
 #define OMAP4_KBD_FULLCODE63_32		0x48

 /* OMAP4 bit definitions */
 #define OMAP4_DEF_IRQENABLE_EVENTEN	BIT(0)
 #define OMAP4_DEF_IRQENABLE_LONGKEY	BIT(1)
 #define OMAP4_DEF_WUP_EVENT_ENA		BIT(0)
 #define OMAP4_DEF_WUP_LONG_KEY_ENA	BIT(1)
 #define OMAP4_DEF_CTRL_NOSOFTMODE	BIT(1)
 #define OMAP4_DEF_CTRL_PTV_SHIFT	2

 /* OMAP4 values */
 #define OMAP4_VAL_IRQDISABLE		0x0

 /*
  * Errata i689: If a key is released for a time shorter than debounce time,
  * the keyboard will idle and never detect the key release. The workaround
  * is to use at least a 12ms debounce time. See omap5432 TRM chapter
  * "26.4.6.2 Keyboard Controller Timer" for more information.
  */
 #define OMAP4_KEYPAD_PTV_DIV_128        0x6
 #define OMAP4_KEYPAD_DEBOUNCINGTIME_MS(dbms, ptv)     \
 	((((dbms) * 1000) / ((1 << ((ptv) + 1)) * (1000000 / 32768))) - 1)
 #define OMAP4_VAL_DEBOUNCINGTIME_16MS					\
 	OMAP4_KEYPAD_DEBOUNCINGTIME_MS(16, OMAP4_KEYPAD_PTV_DIV_128)
 #define OMAP4_KEYPAD_AUTOIDLE_MS	50	/* Approximate measured time */
 #define OMAP4_KEYPAD_IDLE_CHECK_MS	(OMAP4_KEYPAD_AUTOIDLE_MS / 2)

 enum {
 	KBD_REVISION_OMAP4 = 0,
 	KBD_REVISION_OMAP5,
 };

 struct omap4_keypad {
 	struct input_dev *input;

 	void __iomem *base;
 	unsigned int irq;
 	struct mutex lock;		/* for key scan */

 	unsigned int rows;
 	unsigned int cols;
 	u32 reg_offset;
 	u32 irqreg_offset;
 	unsigned int row_shift;
 	bool no_autorepeat;
 	u64 keys;
 	unsigned short *keymap;
 	struct clk *fck;
 };

 static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
 {
 	return __raw_readl(keypad_data->base +
 				keypad_data->reg_offset + offset);
 }

 static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
 {
 	__raw_writel(value,
 		     keypad_data->base + keypad_data->reg_offset + offset);
 }

 static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
 {
 	return __raw_readl(keypad_data->base +
 				keypad_data->irqreg_offset + offset);
 }

 static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
 			     u32 offset, u32 value)
 {
 	__raw_writel(value,
 		     keypad_data->base + keypad_data->irqreg_offset + offset);
 }

 static int omap4_keypad_report_keys(struct omap4_keypad *keypad_data,
 				    u64 keys, bool down)
 {
 	struct input_dev *input_dev = keypad_data->input;
 	unsigned int col, row, code;
 	DECLARE_BITMAP(mask, 64);
 	unsigned long bit;
 	int events = 0;

 	bitmap_from_u64(mask, keys);

 	for_each_set_bit(bit, mask, keypad_data->rows * BITS_PER_BYTE) {
 		row = bit / BITS_PER_BYTE;
 		col = bit % BITS_PER_BYTE;
 		code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift);

 		input_event(input_dev, EV_MSC, MSC_SCAN, code);
 		input_report_key(input_dev, keypad_data->keymap[code], down);

 		events++;
 	}

 	if (events)
 		input_sync(input_dev);

 	return events;
 }

 static void omap4_keypad_scan_keys(struct omap4_keypad *keypad_data, u64 keys)
 {
 	u64 changed;

 	mutex_lock(&keypad_data->lock);

 	changed = keys ^ keypad_data->keys;

 	/*
 	 * Report key up events separately and first. This matters in case we
 	 * lost key-up interrupt and just now catching up.
 	 */
 	omap4_keypad_report_keys(keypad_data, changed & ~keys, false);

 	/* Report key down events */
 	omap4_keypad_report_keys(keypad_data, changed & keys, true);

 	keypad_data->keys = keys;

 	mutex_unlock(&keypad_data->lock);
 }

 /* Interrupt handlers */
 static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
 {
 	struct omap4_keypad *keypad_data = dev_id;

 	if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS))
 		return IRQ_WAKE_THREAD;

 	return IRQ_NONE;
 }

 static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
 {
 	struct omap4_keypad *keypad_data = dev_id;
 	struct device *dev = keypad_data->input->dev.parent;
 	u32 low, high;
 	int error;
 	u64 keys;

 	error = pm_runtime_resume_and_get(dev);
 	if (error)
 		return IRQ_NONE;

 	low = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
 	high = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
 	keys = low | (u64)high << 32;

 	omap4_keypad_scan_keys(keypad_data, keys);

 	/* clear pending interrupts */
 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));

 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);

 	return IRQ_HANDLED;
 }

 static int omap4_keypad_open(struct input_dev *input)
 {
 	struct omap4_keypad *keypad_data = input_get_drvdata(input);
 	struct device *dev = input->dev.parent;
 	int error;

 	error = pm_runtime_resume_and_get(dev);
 	if (error)
 		return error;

 	error = clk_prepare_enable(keypad_data->fck);
 	if (error)
 		goto out;

 	disable_irq(keypad_data->irq);

 	kbd_writel(keypad_data, OMAP4_KBD_CTRL,
 			OMAP4_DEF_CTRL_NOSOFTMODE |
 			(OMAP4_KEYPAD_PTV_DIV_128 << OMAP4_DEF_CTRL_PTV_SHIFT));
 	kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
 			OMAP4_VAL_DEBOUNCINGTIME_16MS);
 	/* clear pending interrupts */
 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 			OMAP4_DEF_IRQENABLE_EVENTEN);
 	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
 			OMAP4_DEF_WUP_EVENT_ENA);

 	enable_irq(keypad_data->irq);

 out:
 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);

 	return error;
 }

 static void omap4_keypad_stop(struct omap4_keypad *keypad_data)
 {
 	/* Disable interrupts and wake-up events */
 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
 			 OMAP4_VAL_IRQDISABLE);
 	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE, 0);

 	/* clear pending interrupts */
 	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
 			 kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
 }

 static void omap4_keypad_close(struct input_dev *input)
 {
 	struct omap4_keypad *keypad_data = input_get_drvdata(input);
 	struct device *dev = input->dev.parent;
 	int error;

 	error = pm_runtime_resume_and_get(dev);
 	if (error)
 		dev_err(dev, "%s: pm_runtime_resume_and_get() failed: %d\n",
 			__func__, error);

 	disable_irq(keypad_data->irq);
 	omap4_keypad_stop(keypad_data);
 	enable_irq(keypad_data->irq);
 	clk_disable_unprepare(keypad_data->fck);

 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);
 }

 static int omap4_keypad_parse_dt(struct device *dev,
 				 struct omap4_keypad *keypad_data)
 {
 	struct device_node *np = dev->of_node;
 	int err;

 	err = matrix_keypad_parse_properties(dev, &keypad_data->rows,
 					     &keypad_data->cols);
 	if (err)
 		return err;

 	keypad_data->no_autorepeat = of_property_read_bool(np, "linux,input-no-autorepeat");

 	return 0;
 }

 static int omap4_keypad_check_revision(struct device *dev,
 				       struct omap4_keypad *keypad_data)
 {
 	unsigned int rev;

 	rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
 	rev &= 0x03 << 30;
 	rev >>= 30;
 	switch (rev) {
 	case KBD_REVISION_OMAP4:
 		keypad_data->reg_offset = 0x00;
 		keypad_data->irqreg_offset = 0x00;
 		break;
 	case KBD_REVISION_OMAP5:
 		keypad_data->reg_offset = 0x10;
 		keypad_data->irqreg_offset = 0x0c;
 		break;
 	default:
 		dev_err(dev, "Keypad reports unsupported revision %d", rev);
 		return -EINVAL;
 	}

 	return 0;
 }

 /*
  * Errata ID i689 "1.32 Keyboard Key Up Event Can Be Missed".
  * Interrupt may not happen for key-up events. We must clear stuck
  * key-up events after the keyboard hardware has auto-idled.
  */
 static int omap4_keypad_runtime_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
 	u32 active;

 	active = kbd_readl(keypad_data, OMAP4_KBD_STATEMACHINE);
 	if (active) {
 		pm_runtime_mark_last_busy(dev);
 		return -EBUSY;
 	}

 	omap4_keypad_scan_keys(keypad_data, 0);

 	return 0;
 }

 static const struct dev_pm_ops omap4_keypad_pm_ops = {
 	RUNTIME_PM_OPS(omap4_keypad_runtime_suspend, NULL, NULL)
 };

 static void omap4_disable_pm(void *d)
 {
 	pm_runtime_dont_use_autosuspend(d);
 	pm_runtime_disable(d);
 }

 static int omap4_keypad_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct omap4_keypad *keypad_data;
 	struct input_dev *input_dev;
 	unsigned int max_keys;
 	int irq;
 	int error;

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;

 	keypad_data = devm_kzalloc(dev, sizeof(*keypad_data), GFP_KERNEL);
 	if (!keypad_data) {
 		dev_err(dev, "keypad_data memory allocation failed\n");
 		return -ENOMEM;
 	}

 	keypad_data->irq = irq;
 	keypad_data->fck = devm_clk_get(&pdev->dev, "fck");
 	if (IS_ERR(keypad_data->fck))
 		return dev_err_probe(&pdev->dev, PTR_ERR(keypad_data->fck),
 				     "unable to get fck");

 	mutex_init(&keypad_data->lock);
 	platform_set_drvdata(pdev, keypad_data);

 	error = omap4_keypad_parse_dt(dev, keypad_data);
 	if (error)
 		return error;

 	keypad_data->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(keypad_data->base))
 		return PTR_ERR(keypad_data->base);

 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_set_autosuspend_delay(dev, OMAP4_KEYPAD_IDLE_CHECK_MS);
 	pm_runtime_enable(dev);

 	error = devm_add_action_or_reset(dev, omap4_disable_pm, dev);
 	if (error) {
 		dev_err(dev, "unable to register cleanup action\n");
 		return error;
 	}

 	/*
 	 * Enable clocks for the keypad module so that we can read
 	 * revision register.
 	 */
 	error = pm_runtime_resume_and_get(dev);
 	if (error) {
 		dev_err(dev, "pm_runtime_resume_and_get() failed\n");
 		return error;
 	}

 	error = omap4_keypad_check_revision(dev, keypad_data);
 	if (!error) {
 		/* Ensure device does not raise interrupts */
 		omap4_keypad_stop(keypad_data);
 	}

 	pm_runtime_mark_last_busy(dev);
 	pm_runtime_put_autosuspend(dev);
 	if (error)
 		return error;

 	/* input device allocation */
 	keypad_data->input = input_dev = devm_input_allocate_device(dev);
 	if (!input_dev)
 		return -ENOMEM;

 	input_dev->name = pdev->name;
 	input_dev->id.bustype = BUS_HOST;
 	input_dev->id.vendor = 0x0001;
 	input_dev->id.product = 0x0001;
 	input_dev->id.version = 0x0001;

 	input_dev->open = omap4_keypad_open;
 	input_dev->close = omap4_keypad_close;

 	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 	if (!keypad_data->no_autorepeat)
 		__set_bit(EV_REP, input_dev->evbit);

 	input_set_drvdata(input_dev, keypad_data);

 	keypad_data->row_shift = get_count_order(keypad_data->cols);
 	max_keys = keypad_data->rows << keypad_data->row_shift;
 	keypad_data->keymap = devm_kcalloc(dev,
 					   max_keys,
 					   sizeof(keypad_data->keymap[0]),
 					   GFP_KERNEL);
 	if (!keypad_data->keymap) {
 		dev_err(dev, "Not enough memory for keymap\n");
 		return -ENOMEM;
 	}

 	error = matrix_keypad_build_keymap(NULL, NULL,
 					   keypad_data->rows, keypad_data->cols,
 					   keypad_data->keymap, input_dev);
 	if (error) {
 		dev_err(dev, "failed to build keymap\n");
 		return error;
 	}

 	error = devm_request_threaded_irq(dev, keypad_data->irq,
 					  omap4_keypad_irq_handler,
 					  omap4_keypad_irq_thread_fn,
 					  IRQF_ONESHOT,
 					  "omap4-keypad", keypad_data);
 	if (error) {
 		dev_err(dev, "failed to register interrupt\n");
 		return error;
 	}

 	error = input_register_device(keypad_data->input);
 	if (error) {
 		dev_err(dev, "failed to register input device\n");
 		return error;
 	}

 	device_init_wakeup(dev, true);
 	error = dev_pm_set_wake_irq(dev, keypad_data->irq);
 	if (error)
 		dev_warn(dev, "failed to set up wakeup irq: %d\n", error);

 	return 0;
 }

 static void omap4_keypad_remove(struct platform_device *pdev)
 {
 	dev_pm_clear_wake_irq(&pdev->dev);
 }

 static const struct of_device_id omap_keypad_dt_match[] = {
 	{ .compatible = "ti,omap4-keypad" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);

 static struct platform_driver omap4_keypad_driver = {
 	.probe		= omap4_keypad_probe,
 	.remove_new	= omap4_keypad_remove,
 	.driver		= {
 		.name	= "omap4-keypad",
 		.of_match_table = omap_keypad_dt_match,
 		.pm = pm_ptr(&omap4_keypad_pm_ops),
 	},
 };
 module_platform_driver(omap4_keypad_driver);

 MODULE_AUTHOR("Texas Instruments");
 MODULE_DESCRIPTION("OMAP4 Keypad Driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:omap4-keypad");
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* OMAP4 Keypad Driver
	*
	* Copyright (C) 2010 Texas Instruments
	*
	* Author: Abraham Arce <x0066660@ti.com>
	* Initial Code: Syed Rafiuddin <rafiuddin.syed@ti.com>
	*/

	#include <linux/module.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>
	#include <linux/clk.h>
	#include <linux/errno.h>
	#include <linux/io.h>
	#include <linux/of.h>
	#include <linux/input.h>
	#include <linux/input/matrix_keypad.h>
	#include <linux/slab.h>
	#include <linux/pm_runtime.h>
	#include <linux/pm_wakeirq.h>

	/* OMAP4 registers */
	#define OMAP4_KBD_REVISION 0x00
	#define OMAP4_KBD_SYSCONFIG 0x10
	#define OMAP4_KBD_SYSSTATUS 0x14
	#define OMAP4_KBD_IRQSTATUS 0x18
	#define OMAP4_KBD_IRQENABLE 0x1C
	#define OMAP4_KBD_WAKEUPENABLE 0x20
	#define OMAP4_KBD_PENDING 0x24
	#define OMAP4_KBD_CTRL 0x28
	#define OMAP4_KBD_DEBOUNCINGTIME 0x2C
	#define OMAP4_KBD_LONGKEYTIME 0x30
	#define OMAP4_KBD_TIMEOUT 0x34
	#define OMAP4_KBD_STATEMACHINE 0x38
	#define OMAP4_KBD_ROWINPUTS 0x3C
	#define OMAP4_KBD_COLUMNOUTPUTS 0x40
	#define OMAP4_KBD_FULLCODE31_0 0x44
	#define OMAP4_KBD_FULLCODE63_32 0x48

	/* OMAP4 bit definitions */
	#define OMAP4_DEF_IRQENABLE_EVENTEN BIT(0)
	#define OMAP4_DEF_IRQENABLE_LONGKEY BIT(1)
	#define OMAP4_DEF_WUP_EVENT_ENA BIT(0)
	#define OMAP4_DEF_WUP_LONG_KEY_ENA BIT(1)
	#define OMAP4_DEF_CTRL_NOSOFTMODE BIT(1)
	#define OMAP4_DEF_CTRL_PTV_SHIFT 2

	/* OMAP4 values */
	#define OMAP4_VAL_IRQDISABLE 0x0

	/*
	* Errata i689: If a key is released for a time shorter than debounce time,
	* the keyboard will idle and never detect the key release. The workaround
	* is to use at least a 12ms debounce time. See omap5432 TRM chapter
	* "26.4.6.2 Keyboard Controller Timer" for more information.
	*/
	#define OMAP4_KEYPAD_PTV_DIV_128 0x6
	#define OMAP4_KEYPAD_DEBOUNCINGTIME_MS(dbms, ptv) \
	((((dbms) * 1000) / ((1 << ((ptv) + 1)) * (1000000 / 32768))) - 1)
	#define OMAP4_VAL_DEBOUNCINGTIME_16MS \
	OMAP4_KEYPAD_DEBOUNCINGTIME_MS(16, OMAP4_KEYPAD_PTV_DIV_128)
	#define OMAP4_KEYPAD_AUTOIDLE_MS 50 /* Approximate measured time */
	#define OMAP4_KEYPAD_IDLE_CHECK_MS (OMAP4_KEYPAD_AUTOIDLE_MS / 2)

	enum {
	KBD_REVISION_OMAP4 = 0,
	KBD_REVISION_OMAP5,
	};

	struct omap4_keypad {
	struct input_dev *input;

	void __iomem *base;
	unsigned int irq;
	struct mutex lock; /* for key scan */

	unsigned int rows;
	unsigned int cols;
	u32 reg_offset;
	u32 irqreg_offset;
	unsigned int row_shift;
	bool no_autorepeat;
	u64 keys;
	unsigned short *keymap;
	struct clk *fck;
	};

	static int kbd_readl(struct omap4_keypad *keypad_data, u32 offset)
	{
	return __raw_readl(keypad_data->base +
	keypad_data->reg_offset + offset);
	}

	static void kbd_writel(struct omap4_keypad *keypad_data, u32 offset, u32 value)
	{
	__raw_writel(value,
	keypad_data->base + keypad_data->reg_offset + offset);
	}

	static int kbd_read_irqreg(struct omap4_keypad *keypad_data, u32 offset)
	{
	return __raw_readl(keypad_data->base +
	keypad_data->irqreg_offset + offset);
	}

	static void kbd_write_irqreg(struct omap4_keypad *keypad_data,
	u32 offset, u32 value)
	{
	__raw_writel(value,
	keypad_data->base + keypad_data->irqreg_offset + offset);
	}

	static int omap4_keypad_report_keys(struct omap4_keypad *keypad_data,
	u64 keys, bool down)
	{
	struct input_dev *input_dev = keypad_data->input;
	unsigned int col, row, code;
	DECLARE_BITMAP(mask, 64);
	unsigned long bit;
	int events = 0;

	bitmap_from_u64(mask, keys);

	for_each_set_bit(bit, mask, keypad_data->rows * BITS_PER_BYTE) {
	row = bit / BITS_PER_BYTE;
	col = bit % BITS_PER_BYTE;
	code = MATRIX_SCAN_CODE(row, col, keypad_data->row_shift);

	input_event(input_dev, EV_MSC, MSC_SCAN, code);
	input_report_key(input_dev, keypad_data->keymap[code], down);

	events++;
	}

	if (events)
	input_sync(input_dev);

	return events;
	}

	static void omap4_keypad_scan_keys(struct omap4_keypad *keypad_data, u64 keys)
	{
	u64 changed;

	mutex_lock(&keypad_data->lock);

	changed = keys ^ keypad_data->keys;

	/*
	* Report key up events separately and first. This matters in case we
	* lost key-up interrupt and just now catching up.
	*/
	omap4_keypad_report_keys(keypad_data, changed & ~keys, false);

	/* Report key down events */
	omap4_keypad_report_keys(keypad_data, changed & keys, true);

	keypad_data->keys = keys;

	mutex_unlock(&keypad_data->lock);
	}

	/* Interrupt handlers */
	static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
	{
	struct omap4_keypad *keypad_data = dev_id;

	if (kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS))
	return IRQ_WAKE_THREAD;

	return IRQ_NONE;
	}

	static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
	{
	struct omap4_keypad *keypad_data = dev_id;
	struct device *dev = keypad_data->input->dev.parent;
	u32 low, high;
	int error;
	u64 keys;

	error = pm_runtime_resume_and_get(dev);
	if (error)
	return IRQ_NONE;

	low = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
	high = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
	keys = low \| (u64)high << 32;

	omap4_keypad_scan_keys(keypad_data, keys);

	/* clear pending interrupts */
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
	kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);

	return IRQ_HANDLED;
	}

	static int omap4_keypad_open(struct input_dev *input)
	{
	struct omap4_keypad *keypad_data = input_get_drvdata(input);
	struct device *dev = input->dev.parent;
	int error;

	error = pm_runtime_resume_and_get(dev);
	if (error)
	return error;

	error = clk_prepare_enable(keypad_data->fck);
	if (error)
	goto out;

	disable_irq(keypad_data->irq);

	kbd_writel(keypad_data, OMAP4_KBD_CTRL,
	OMAP4_DEF_CTRL_NOSOFTMODE \|
	(OMAP4_KEYPAD_PTV_DIV_128 << OMAP4_DEF_CTRL_PTV_SHIFT));
	kbd_writel(keypad_data, OMAP4_KBD_DEBOUNCINGTIME,
	OMAP4_VAL_DEBOUNCINGTIME_16MS);
	/* clear pending interrupts */
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
	kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
	OMAP4_DEF_IRQENABLE_EVENTEN);
	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE,
	OMAP4_DEF_WUP_EVENT_ENA);

	enable_irq(keypad_data->irq);

	out:
	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);

	return error;
	}

	static void omap4_keypad_stop(struct omap4_keypad *keypad_data)
	{
	/* Disable interrupts and wake-up events */
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
	OMAP4_VAL_IRQDISABLE);
	kbd_writel(keypad_data, OMAP4_KBD_WAKEUPENABLE, 0);

	/* clear pending interrupts */
	kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
	kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
	}

	static void omap4_keypad_close(struct input_dev *input)
	{
	struct omap4_keypad *keypad_data = input_get_drvdata(input);
	struct device *dev = input->dev.parent;
	int error;

	error = pm_runtime_resume_and_get(dev);
	if (error)
	dev_err(dev, "%s: pm_runtime_resume_and_get() failed: %d\n",
	__func__, error);

	disable_irq(keypad_data->irq);
	omap4_keypad_stop(keypad_data);
	enable_irq(keypad_data->irq);
	clk_disable_unprepare(keypad_data->fck);

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);
	}

	static int omap4_keypad_parse_dt(struct device *dev,
	struct omap4_keypad *keypad_data)
	{
	struct device_node *np = dev->of_node;
	int err;

	err = matrix_keypad_parse_properties(dev, &keypad_data->rows,
	&keypad_data->cols);
	if (err)
	return err;

	keypad_data->no_autorepeat = of_property_read_bool(np, "linux,input-no-autorepeat");

	return 0;
	}

	static int omap4_keypad_check_revision(struct device *dev,
	struct omap4_keypad *keypad_data)
	{
	unsigned int rev;

	rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
	rev &= 0x03 << 30;
	rev >>= 30;
	switch (rev) {
	case KBD_REVISION_OMAP4:
	keypad_data->reg_offset = 0x00;
	keypad_data->irqreg_offset = 0x00;
	break;
	case KBD_REVISION_OMAP5:
	keypad_data->reg_offset = 0x10;
	keypad_data->irqreg_offset = 0x0c;
	break;
	default:
	dev_err(dev, "Keypad reports unsupported revision %d", rev);
	return -EINVAL;
	}

	return 0;
	}

	/*
	* Errata ID i689 "1.32 Keyboard Key Up Event Can Be Missed".
	* Interrupt may not happen for key-up events. We must clear stuck
	* key-up events after the keyboard hardware has auto-idled.
	*/
	static int omap4_keypad_runtime_suspend(struct device *dev)
	{
	struct platform_device *pdev = to_platform_device(dev);
	struct omap4_keypad *keypad_data = platform_get_drvdata(pdev);
	u32 active;

	active = kbd_readl(keypad_data, OMAP4_KBD_STATEMACHINE);
	if (active) {
	pm_runtime_mark_last_busy(dev);
	return -EBUSY;
	}

	omap4_keypad_scan_keys(keypad_data, 0);

	return 0;
	}

	static const struct dev_pm_ops omap4_keypad_pm_ops = {
	RUNTIME_PM_OPS(omap4_keypad_runtime_suspend, NULL, NULL)
	};

	static void omap4_disable_pm(void *d)
	{
	pm_runtime_dont_use_autosuspend(d);
	pm_runtime_disable(d);
	}

	static int omap4_keypad_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct omap4_keypad *keypad_data;
	struct input_dev *input_dev;
	unsigned int max_keys;
	int irq;
	int error;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;

	keypad_data = devm_kzalloc(dev, sizeof(*keypad_data), GFP_KERNEL);
	if (!keypad_data) {
	dev_err(dev, "keypad_data memory allocation failed\n");
	return -ENOMEM;
	}

	keypad_data->irq = irq;
	keypad_data->fck = devm_clk_get(&pdev->dev, "fck");
	if (IS_ERR(keypad_data->fck))
	return dev_err_probe(&pdev->dev, PTR_ERR(keypad_data->fck),
	"unable to get fck");

	mutex_init(&keypad_data->lock);
	platform_set_drvdata(pdev, keypad_data);

	error = omap4_keypad_parse_dt(dev, keypad_data);
	if (error)
	return error;

	keypad_data->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(keypad_data->base))
	return PTR_ERR(keypad_data->base);

	pm_runtime_use_autosuspend(dev);
	pm_runtime_set_autosuspend_delay(dev, OMAP4_KEYPAD_IDLE_CHECK_MS);
	pm_runtime_enable(dev);

	error = devm_add_action_or_reset(dev, omap4_disable_pm, dev);
	if (error) {
	dev_err(dev, "unable to register cleanup action\n");
	return error;
	}

	/*
	* Enable clocks for the keypad module so that we can read
	* revision register.
	*/
	error = pm_runtime_resume_and_get(dev);
	if (error) {
	dev_err(dev, "pm_runtime_resume_and_get() failed\n");
	return error;
	}

	error = omap4_keypad_check_revision(dev, keypad_data);
	if (!error) {
	/* Ensure device does not raise interrupts */
	omap4_keypad_stop(keypad_data);
	}

	pm_runtime_mark_last_busy(dev);
	pm_runtime_put_autosuspend(dev);
	if (error)
	return error;

	/* input device allocation */
	keypad_data->input = input_dev = devm_input_allocate_device(dev);
	if (!input_dev)
	return -ENOMEM;

	input_dev->name = pdev->name;
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0001;

	input_dev->open = omap4_keypad_open;
	input_dev->close = omap4_keypad_close;

	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
	if (!keypad_data->no_autorepeat)
	__set_bit(EV_REP, input_dev->evbit);

	input_set_drvdata(input_dev, keypad_data);

	keypad_data->row_shift = get_count_order(keypad_data->cols);
	max_keys = keypad_data->rows << keypad_data->row_shift;
	keypad_data->keymap = devm_kcalloc(dev,
	max_keys,
	sizeof(keypad_data->keymap[0]),
	GFP_KERNEL);
	if (!keypad_data->keymap) {
	dev_err(dev, "Not enough memory for keymap\n");
	return -ENOMEM;
	}

	error = matrix_keypad_build_keymap(NULL, NULL,
	keypad_data->rows, keypad_data->cols,
	keypad_data->keymap, input_dev);
	if (error) {
	dev_err(dev, "failed to build keymap\n");
	return error;
	}

	error = devm_request_threaded_irq(dev, keypad_data->irq,
	omap4_keypad_irq_handler,
	omap4_keypad_irq_thread_fn,
	IRQF_ONESHOT,
	"omap4-keypad", keypad_data);
	if (error) {
	dev_err(dev, "failed to register interrupt\n");
	return error;
	}

	error = input_register_device(keypad_data->input);
	if (error) {
	dev_err(dev, "failed to register input device\n");
	return error;
	}

	device_init_wakeup(dev, true);
	error = dev_pm_set_wake_irq(dev, keypad_data->irq);
	if (error)
	dev_warn(dev, "failed to set up wakeup irq: %d\n", error);

	return 0;
	}

	static void omap4_keypad_remove(struct platform_device *pdev)
	{
	dev_pm_clear_wake_irq(&pdev->dev);
	}

	static const struct of_device_id omap_keypad_dt_match[] = {
	{ .compatible = "ti,omap4-keypad" },
	{},
	};
	MODULE_DEVICE_TABLE(of, omap_keypad_dt_match);

	static struct platform_driver omap4_keypad_driver = {
	.probe = omap4_keypad_probe,
	.remove_new = omap4_keypad_remove,
	.driver = {
	.name = "omap4-keypad",
	.of_match_table = omap_keypad_dt_match,
	.pm = pm_ptr(&omap4_keypad_pm_ops),
	},
	};
	module_platform_driver(omap4_keypad_driver);

	MODULE_AUTHOR("Texas Instruments");
	MODULE_DESCRIPTION("OMAP4 Keypad Driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:omap4-keypad");